EP0702094A1 - Use of a hardenable copper alloy - Google Patents

Use of a hardenable copper alloy Download PDF

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Publication number
EP0702094A1
EP0702094A1 EP95110134A EP95110134A EP0702094A1 EP 0702094 A1 EP0702094 A1 EP 0702094A1 EP 95110134 A EP95110134 A EP 95110134A EP 95110134 A EP95110134 A EP 95110134A EP 0702094 A1 EP0702094 A1 EP 0702094A1
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EP
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Prior art keywords
copper alloy
nickel
hardenable
mold
casting
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EP95110134A
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German (de)
French (fr)
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EP0702094B1 (en
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Horst Gravemann
Dirk Dr. Rode
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KME Special Products GmbH and Co KG
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KM Europa Metal AG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/01—Alloys based on copper with aluminium as the next major constituent

Definitions

  • the invention relates to the use of a hardenable copper alloy as a material with selectively adjustable electrical conductivity for the production of casting molds, in particular continuous casting molds, in which molten metal is stirred by the action of electromagnetic forces.
  • the liquid metal melt is brought transversely to the strand withdrawal direction during the casting in the stirring device under the action of an electrical rotating field and is set in a circular motion by the resulting induction currents, which is essentially concentric to the longitudinal axis of the strand.
  • the result is a homogeneous cast structure that meets particularly high quality requirements.
  • stirring devices are usually arranged below the mold so that the remaining molten metal in the partially solidified strand can be stirred just below the mold.
  • the mold materials used in the continuous casting of steel generally have high thermal conductivity at the same time as high mechanical strength to ensure optimum heat dissipation and cooling performance.
  • the associated high maximum casting speed increases the economic efficiency of continuous steel casting.
  • the high electrical conductivity of the proven mold materials such as copper-chromium-zirconium alloys, with greater than 85% IACS proves to be disadvantageous.
  • the high electrical conductivity leads to an undesirably high shielding effect of the mold material in relation to the magnetic field generated for stirring. This weakening of the magnetic field results in a lower depth effect of the stirring effect.
  • the stirring effect can be increased by increasing the current intensity, the technical effort required for this increases disproportionately. Overall, therefore, an optimal stirring effect cannot be achieved with mold materials having a high thermal conductivity.
  • Mold materials with lower thermal conductivity are already known. However, these have extremely high strengths, so that they are preferably used at higher temperatures. In addition, the processing of these mold materials is relatively complex due to the extremely high strength. Another disadvantage is that the elongation at break at temperatures above 350 ° C is too low.
  • the known mold materials with lower thermal conductivity are therefore not an economical alternative to the highly conductive mold materials, such as copper-chrome-zirconium alloys, for use in casting plants with electromagnetic stirring devices.
  • the object of the present invention is therefore to provide a hardenable copper material, in particular for use in casting plants with an electromagnetic stirring device, which produces low field damping and which also has favorable strength and elongation at break properties.
  • the solution to this problem consists in the use of a hardenable copper alloy of 0.1 to 2.0% nickel, 0.3 to 1.3% chromium, 0.1 to 0.5% zirconium, up to 0.2% of at least one Elements from the group comprising phosphorus, lithium, calcium, magnesium, silicon and boron, the rest copper including impurities as a material with selectively adjustable electrical conductivity for the production of casting molds, in particular continuous casting molds, in which molten metal is stirred by the action of electromagnetic forces.
  • the alloy to be used according to the invention preferably contains 0.4 to 1.6% nickel, 0.6 to 0.8% chromium, 0.15 to 0.25% zirconium, at least one element from the group 0.005 to 0.02% boron , 0.005 to 0.05% magnesium and 0.005 to 0.03% phosphorus, balance copper including unavoidable impurities.
  • the boron additive can be added to the melt, for example as calcium boride.
  • the copper alloy according to the invention is distinguished by a particularly advantageous combination of mechanical and physical properties. With an electrical conductivity below 80% IACS, this copper alloy also fulfills the essential requirement for low field damping of a mold wall made from this alloy.
  • a low titanium content forms intermetallic compounds with the components nickel and iron in the alloy, which increase strength.
  • composition of nine example alloys is given in Table 1 in% by weight.
  • X denotes the total content of the individual elements boron, magnesium and / or phosphorus, which are added up to a total of 0.05% as deoxidizing agents. Higher levels can also be used to increase the strength of the alloy.
  • Copper alloys with different nickel contents of 0.2 to 2%, about 0.7% chromium, 0.16 to 0.2% zirconium, up to 0.02% boron, magnesium and / or phosphorus, the rest of copper including manufacturing-related impurities were initially melted, cast into rolled ingots and then hot rolled at 950 ° C in several passes with a total degree of forming of 65%. After at least 1 hour solution annealing at 1 030 ° C and a subsequent quenching in water, the rolled plates were at at least 4 hours 475 ° C hardened. After final machining, the mold plates each had the property values summarized in Table 2, depending on the nickel content (0.2 to 2% nickel).
  • the first-mentioned property value is assigned to the copper alloy with 0.2% nickel content to be used according to the invention.
  • the alloys to be used according to the invention have an electrical conductivity which can be set by choosing the nickel concentration within the range of about 35 to 80% IACS, the mechanical properties remaining largely unchanged. With increasing nickel content up to 2.0%, the yield strength and the tensile strength of the material change only slightly in the entire concentration range in the hardened state higher parameters. A small increase also applies to the heat resistance, e.g. B. at 350 ° C. In contrast, the elongation at break is largely independent of the nickel content, which at a temperature of 350 ° C is reduced only to 10% elongation for an alloy with 2.0% nickel.
  • the resistance of the alloy to be used according to the invention was tested both at room temperature and at a temperature of up to 350 ° C. - corresponding to a cyclical temperature load in the casting operation.
  • the fatigue crack formation resulted in a large degree of independence from the nickel content, so that the known favorable behavior of the copper-chromium-zirconium alloys previously used in the casting operation is also given with regard to the long service life.
  • the increasing hardness with increasing nickel content provides an additional improvement in properties, which also results in a more favorable tribological behavior of the mold material.
  • alloy to be used according to the invention is not only limited to the plate mold described in the exemplary embodiments.
  • Corresponding advantages also arise with other molds with which metallic mold strands can be produced in a semi-continuous or fully continuous manner, for example tubular molds, block molds, casting wheels, casting rolls and casting roll shells.

Abstract

Age-hardenable Cu alloys contg. 0.1-2% Ni, 0.3-1.3% Cr, 0.1-0.5% Zr, opt. NOTGREATER 0.2% of at least one of P, Li, Ca, Mg, Si and B, balance Cu and impurities are used as materials with adjustable electrical conductivity to mfr. casting moulds, esp. continuous casting moulds in which molten metal is stirred by electromagnetic forces.

Description

Die Erfindung betrifft die Verwendung einer aushärtbaren Kupferlegierung als Werkstoff mit gezielt einstellbarer elektrischer Leitfähigkeit zur Herstellung von Gießformen, insbesondere Stranggießkokillen, bei denen schmelzflüssiges Metall durch Einwirkung von elektromagnetischen Kräften gerührt wird.The invention relates to the use of a hardenable copper alloy as a material with selectively adjustable electrical conductivity for the production of casting molds, in particular continuous casting molds, in which molten metal is stirred by the action of electromagnetic forces.

Beim Stranggießen von insbesondere Stahl ist es allgemein bekannt, daß eine Qualitätsverbesserung durch elektromagnetisches Rühren der in der gekühlten Stranggießkokille befindlichen Schmelze erreicht werden kann. Mit elektromagnetischen Rühreinrichtungen wird dem flüssigen Kern der Metallschmelze innerhalb der erstarrten Strangschale eine gewünschte Strömung aufgezwungen, die das Gußgefüge des Strangs nachteilig beeinflussende Seigerungen während des Erstarrungsvorgangs verhindert.In the continuous casting of steel in particular, it is generally known that an improvement in quality can be achieved by electromagnetic stirring of the melt located in the cooled continuous casting mold. With electromagnetic stirring devices, a desired flow is forced on the liquid core of the molten metal within the solidified strand shell, which prevents segregations which adversely affect the casting structure of the strand during the solidification process.

Die flüssige Metallschmelze wird während des Gießens in der Rühreinrichtung unter Einwirkung eines elektrischen Drehfeldes quer zur Strangabzugsrichtung gebracht und durch die entstehenden Induktionsströme in eine kreisende Bewegung versetzt, die im wesentlichen konzentrisch zur Stranglängsachse verläuft. Als Ergebnis erhält man ein homogenes Gußgefüge, das besonders hohe Qualitätsansprüche erfüllt. Um den technischen Aufwand möglichst gering zu halten, ordnet man Rühreinrichtungen üblicherweise unterhalb der Kokille an, damit das restliche schmelzflüssige Metall im teilerstarrten Strang dicht unter der Kokille gerührt werden kann. Um aber das Erstarrungsgefüge auch in den zuerst erstarrenden äußeren Randbereichen des Strangs beeinflussen zu können, ist es günstig, die Rühreinrichtung entweder in Höhe der Kokille oder in der Kokille selbst unterzubringen.The liquid metal melt is brought transversely to the strand withdrawal direction during the casting in the stirring device under the action of an electrical rotating field and is set in a circular motion by the resulting induction currents, which is essentially concentric to the longitudinal axis of the strand. The result is a homogeneous cast structure that meets particularly high quality requirements. To the To keep technical expenditure as low as possible, stirring devices are usually arranged below the mold so that the remaining molten metal in the partially solidified strand can be stirred just below the mold. However, in order to be able to influence the solidification structure in the initially solidifying outer edge regions of the strand, it is advantageous to accommodate the stirring device either at the level of the mold or in the mold itself.

Die beim Stranggießen von Stahl eingesetzten Kokillenwerkstoffe weisen in der Regel bei hoher mechanischer Festigkeit gleichzeitig eine hohe Wärmeleitfähigkeit auf, um eine optimale Wärmeabfuhr und Kühlleistung sicherzustellen. Die damit verbundene hohe maximale Gießgeschwindigkeit vergrößert die Wirtschaftlichkeit des Stahlstranggießens. Bei Anordnung einer Induktions-Rühreinrichtung erweist sich die hohe elektrische Leitfähigkeit der bewährten Kokillenwerkstoffe, wie beispielsweise Kupfer-Chrom-Zirkonium-Legierungen, mit größer als 85 % IACS jedoch als nachteilig. Die hohe elektrische Leitfähigkeit führt zu einer unerwünscht hohen Abschirmwirkung des Kokillenwerkstoffs in Bezug auf das zum Rühren erzeugte Magnetfeld. Diese Abschwächung des Magnetfeldes resultiert in einer geringeren Tiefenwirkung des Rühreffekts. Zwar kann die Rührwirkung durch Erhöhung der Stromstärke verstärkt werden, wodurch allerdings der dazu notwendige technische Aufwand überproportional ansteigt. Insgesamt ist also eine optimale Rührwirkung mit eine hohe Wärmeleitfähigkeit aufweisenden Kokillenwerkstoffen nicht erreichbar.The mold materials used in the continuous casting of steel generally have high thermal conductivity at the same time as high mechanical strength to ensure optimum heat dissipation and cooling performance. The associated high maximum casting speed increases the economic efficiency of continuous steel casting. If an induction stirrer is arranged, the high electrical conductivity of the proven mold materials, such as copper-chromium-zirconium alloys, with greater than 85% IACS proves to be disadvantageous. The high electrical conductivity leads to an undesirably high shielding effect of the mold material in relation to the magnetic field generated for stirring. This weakening of the magnetic field results in a lower depth effect of the stirring effect. Although the stirring effect can be increased by increasing the current intensity, the technical effort required for this increases disproportionately. Overall, therefore, an optimal stirring effect cannot be achieved with mold materials having a high thermal conductivity.

Es sind zwar auch schon Kokillenwerkstoffe mit geringerer Wärmeleitfähigkeit bekannt. Diese weisen jedoch extrem hohe Festigkeiten auf, so daß sie vorzugsweise bei höheren Temperaturen eingesetzt werden. Zudem ist die Bearbeitung dieser Kokillenwerkstoffe durch die extrem hohe Festigkeit relativ aufwendig. Als weiterer Nachteil kommt hinzu, daß die Bruchdehnung bei Temperaturen oberhalb von 350 °C zu gering ist.Mold materials with lower thermal conductivity are already known. However, these have extremely high strengths, so that they are preferably used at higher temperatures. In addition, the processing of these mold materials is relatively complex due to the extremely high strength. Another disadvantage is that the elongation at break at temperatures above 350 ° C is too low.

Die bekannten Kokillenwerkstoffe geringerer Wärmeleitfähigkeit stellen somit keine wirtschaftliche Alternative zu den hochleitfähigen Kokillenwerkstoffen, wie beispielsweise Kupfer-Chrom-Zirkonium-Legierungen, für den Einsatz in Gießanlagen mit elektromagnetischer Rühreinrichtung dar.The known mold materials with lower thermal conductivity are therefore not an economical alternative to the highly conductive mold materials, such as copper-chrome-zirconium alloys, for use in casting plants with electromagnetic stirring devices.

Aufgabe der vorliegenden Erfindung ist es daher, einen aushärtbaren Kupferwerkstoff, insbesondere für den Einsatz in Gießanlagen mit einer elektromagnetischen Rührvorrichtung, bereitzustellen, der eine geringe Felddämpfung hervorruft und der weiterhin günstige Festigkeits- und Bruchdehnungseigenschaften besitzt.The object of the present invention is therefore to provide a hardenable copper material, in particular for use in casting plants with an electromagnetic stirring device, which produces low field damping and which also has favorable strength and elongation at break properties.

Die Lösung dieser Aufgabe besteht in der Verwendung einer aushärtbaren Kupferlegierung aus 0,1 bis 2,0 % Nickel, 0,3 bis 1,3 % Chrom, 0,1 bis 0,5 % Zirkonium, bis zu 0,2 % mindestens eines Elements aus der Phosphor, Lithium, Kalzium, Magnesium, Silizium und Bor umfassenden Gruppe, Rest Kupfer einschließlich Verunreinigungen als Werkstoff mit gezielt einstellbarer elektrischer Leitfähigkeit für die Herstellung von Gießformen, insbesondere Stranggießkokillen, bei denen schmelzflüssiges Metall durch Einwirkung elektromagnetischer Kräfte gerührt wird.The solution to this problem consists in the use of a hardenable copper alloy of 0.1 to 2.0% nickel, 0.3 to 1.3% chromium, 0.1 to 0.5% zirconium, up to 0.2% of at least one Elements from the group comprising phosphorus, lithium, calcium, magnesium, silicon and boron, the rest copper including impurities as a material with selectively adjustable electrical conductivity for the production of casting molds, in particular continuous casting molds, in which molten metal is stirred by the action of electromagnetic forces.

Vorzugsweise enthält die erfindungsgemäß zu verwendende Legierung 0,4 bis 1,6 % Nickel, 0,6 bis 0,8 % Chrom, 0,15 bis 0,25 % Zirkonium, mindestens ein Element aus der Gruppe 0,005 bis 0,02 % Bor, 0,005 bis 0,05 % Magnesium und 0,005 bis 0,03 % Phosphor, Rest Kupfer einschließlich unvermeidbarer Verunreinigungen. Der Borzusatz kann der Schmelze beispielsweise als Kalziumborid zugegeben werden.The alloy to be used according to the invention preferably contains 0.4 to 1.6% nickel, 0.6 to 0.8% chromium, 0.15 to 0.25% zirconium, at least one element from the group 0.005 to 0.02% boron , 0.005 to 0.05% magnesium and 0.005 to 0.03% phosphorus, balance copper including unavoidable impurities. The boron additive can be added to the melt, for example as calcium boride.

Überraschenderweise zeichnet sich die erfindungsgemäße Kupferlegierung durch eine besonders vorteilhafte Kombination von mechanischen und physikalischen Eigenschaften aus. Mit einer unterhalb 80 % IACS liegenden elektrischen Leitfähigkeit erfüllt diese Kupferlegierung auch die wesentliche Anforderung an eine geringe Felddämpfung einer aus dieser Legierung hergestellten Kokillenwand.Surprisingly, the copper alloy according to the invention is distinguished by a particularly advantageous combination of mechanical and physical properties. With an electrical conductivity below 80% IACS, this copper alloy also fulfills the essential requirement for low field damping of a mold wall made from this alloy.

Zur weiteren gezielten Erhöhung der Festigkeit ist es vorteilhaft, der Legierung noch bis zu 0,2 % Titan und/oder 0,4 % Eisen zuzusetzen. Ein geringer Titangehalt bildet mit den in der Legierung vorhandenen Komponenten Nickel und Eisen intermetallische Verbindungen, die festigkeitssteigernd wirken.To further increase the strength in a targeted manner, it is advantageous to add up to 0.2% titanium and / or 0.4% iron to the alloy. A low titanium content forms intermetallic compounds with the components nickel and iron in the alloy, which increase strength.

Bis zu jeweils 0,8 % Aluminium und/oder Mangan bewirken ebenfalls eine Festigkeitssteigerung, die sich bei nur geringer Beeinflussung der niedrigen elektrischen Leitfähigkeit vorteilhaft nutzen läßt.Up to 0.8% aluminum and / or manganese each also result in an increase in strength, which can be used advantageously with little influence on the low electrical conductivity.

Die Erfindung wird anhand einiger Ausführungsbeispiele im folgenden noch näher erläutert.The invention is explained in more detail below with the aid of a few exemplary embodiments.

Die Zusammmensetzung von neun Beispiellegierungen ist in Tabelle 1 jeweils in Gew.-% angegeben. Mit X ist der Gesamtgehalt der Einzelelemente Bor, Magnesium und/oder Phosphor zu verstehen, die bis zu insgesamt 0,05 % als Desoxidationsmittel zugesetzt werden. Höhere Gehalte können ebenfalls zur Festigkeitssteigerung der Legierung eingesetzt werden. Tabelle 1 Leg. Ni Cr Zr X Ti Fe Al Mn Cu 1 0,20 0,70 0,18 0,015 Rest 2 0,38 0,65 0,16 0,016 Rest 3 0,65 0,60 0,20 0,012 0,41 0,25 Rest 4 0,81 0,68 0,16 0,014 Rest 5 0,81 0,66 0,17 0,014 0,10 0,22 Rest 6 1,25 0,70 0,15 0,015 Rest 7 1,60 0,66 0,18 0,016 Rest 8 1,68 0,72 0,17 0,016 Rest 9 2,0 0,73 0,16 0,013 Rest The composition of nine example alloys is given in Table 1 in% by weight. X denotes the total content of the individual elements boron, magnesium and / or phosphorus, which are added up to a total of 0.05% as deoxidizing agents. Higher levels can also be used to increase the strength of the alloy. Table 1 Leg. Ni Cr Zr X Ti Fe Al Mn Cu 1 0.20 0.70 0.18 0.015 rest 2nd 0.38 0.65 0.16 0.016 rest 3rd 0.65 0.60 0.20 0.012 0.41 0.25 rest 4th 0.81 0.68 0.16 0.014 rest 5 0.81 0.66 0.17 0.014 0.10 0.22 rest 6 1.25 0.70 0.15 0.015 rest 7 1.60 0.66 0.18 0.016 rest 8th 1.68 0.72 0.17 0.016 rest 9 2.0 0.73 0.16 0.013 rest

Kupferlegierungen mit unterschiedlichen Nickelgehalten von 0,2 bis 2 %, etwa 0,7 % Chrom, 0,16 bis 0,2 % Zirkonium, bis zu 0,02 % Bor, Magnesium und/oder Phosphor, Rest Kupfer einschließlich herstellungsbedingter Verunreinigungen wurden zunächst geschmolzen, zu Walzbarren vergossen und dann bei 950 °C in mehreren Stichen mit einem Gesamtumformgrad von 65 % warmgewalzt. Nach einer mindestens einstündigen Lösungsglühung bei 1 030 °C und einem nachfolgenden Abschrecken in Wasser wurden die gewalzten Platten mindestens 4 Stunden bei 475 °C ausgehärtet. Nach abschließender spanender Bearbeitung wiesen die Kokillenplatten jeweils abhängig vom Nickelanteil (0,2 bis 2 % Nickel) die in Tabelle 2 zusammengefaßten Eigenschaftswerte auf. Wird ein Bereich angegeben, so ist der zuerst genannte Eigenschaftswert der erfindungsgemäß zu verwendenden Kupferlegierung mit 0,2 % Nickelgehalt zugeordnet. Tabelle 2 Elektrische Leitfähigkeit 80 bis 35 % IACS Erweichungstemperatur (10 % Abfall der Festigkeit bei R.T. nach 1 h Glühdauer) 525 °C Härte HB 2,5/62 130 bis 150 Zugfestigkeit 430 bis 450 N/mm² Dehngrenze 325 bis 340 N/mm² Bruchdehnung 28 bis 22 % Warmfestigkeit bei 350 °C 340 bis 355 N/mm² Dehngrenze bei 350 °C 270 bis 290 N/mm² Bruchdehnung bei 350 °C 22 bis 10 % Copper alloys with different nickel contents of 0.2 to 2%, about 0.7% chromium, 0.16 to 0.2% zirconium, up to 0.02% boron, magnesium and / or phosphorus, the rest of copper including manufacturing-related impurities were initially melted, cast into rolled ingots and then hot rolled at 950 ° C in several passes with a total degree of forming of 65%. After at least 1 hour solution annealing at 1 030 ° C and a subsequent quenching in water, the rolled plates were at at least 4 hours 475 ° C hardened. After final machining, the mold plates each had the property values summarized in Table 2, depending on the nickel content (0.2 to 2% nickel). If a range is specified, the first-mentioned property value is assigned to the copper alloy with 0.2% nickel content to be used according to the invention. Table 2 Electric conductivity 80 to 35% IACS Softening temperature (10% drop in strength at RT after 1 h of annealing) 525 ° C Hardness HB 2.5 / 62 130 to 150 tensile strenght 430 to 450 N / mm² Proof stress 325 to 340 N / mm² Elongation at break 28 to 22% Heat resistance at 350 ° C 340 to 355 N / mm² Yield strength at 350 ° C 270 to 290 N / mm² Elongation at break at 350 ° C 22 to 10%

Die erfindungsgemäß zu verwendenden Legierungen besitzen eine elektrische Leitfähigkeit, die durch Wahl der Nickelkonzentration innerhalb des angegebenen Bereichs von etwa 35 bis 80 % IACS eingestellt werden kann, wobei die mechanischen Eigenschaften weitgehend unverändert bleiben. Mit zunehmendem Nickelgehalt bis 2,0 % verändert sich im gesamten Konzentrationsbereich die Dehngrenze und die Zugfestigkeit des Werkstoffs im ausgehärteten Zustand nur geringfügig zu höheren Kennwerten. Ein geringer Anstieg gilt auch für die Warmfestigkeit, z. B. bei 350 °C. Demgegenüber erhält man auch für die Bruchdehnung einen vom Nickelgehalt weitgehend unabhängigen Wert, der sich bei einer Temperatur von 350 °C nur bis auf 10 % Dehnung bei einer Legierung mit 2,0 % Nickelanteil reduziert.The alloys to be used according to the invention have an electrical conductivity which can be set by choosing the nickel concentration within the range of about 35 to 80% IACS, the mechanical properties remaining largely unchanged. With increasing nickel content up to 2.0%, the yield strength and the tensile strength of the material change only slightly in the entire concentration range in the hardened state higher parameters. A small increase also applies to the heat resistance, e.g. B. at 350 ° C. In contrast, the elongation at break is largely independent of the nickel content, which at a temperature of 350 ° C is reduced only to 10% elongation for an alloy with 2.0% nickel.

In ergänzenden dehnungsgeregelten Ermüdungsversuchen wurde die Beständigkeit der erfindungsgemäß zu verwendenden Legierung sowohl bei Raumtemperatur als auch bei einer Temperatur bis zu 350 °C - entsprechend einer zyklischen Temperaturbeanspruchung im Gießbetrieb - geprüft. Die Ermüdungsrißbildung ergab dabei eine weitgehende Unabhängigkeit vom Nickelgehalt, so daß das bekannt günstige Verhalten der im Gießbetrieb bisher eingesetzten Kupfer-Chrom-Zirkonium-Legierungen auch bezüglich auf die hohe Lebensdauer gegeben ist. Die mit steigendem Nickelgehalt zunehmende Härte liefert eine zusätzliche Eigenschaftsverbesserung, aus der auch ein günstigeres tribologisches Verhalten des Kokillenwerkstoffs resultiert.In additional strain-controlled fatigue tests, the resistance of the alloy to be used according to the invention was tested both at room temperature and at a temperature of up to 350 ° C. - corresponding to a cyclical temperature load in the casting operation. The fatigue crack formation resulted in a large degree of independence from the nickel content, so that the known favorable behavior of the copper-chromium-zirconium alloys previously used in the casting operation is also given with regard to the long service life. The increasing hardness with increasing nickel content provides an additional improvement in properties, which also results in a more favorable tribological behavior of the mold material.

Der Einsatz der erfindungsgemäß zu verwendenden Legierung ist nicht nur auf die in den Ausführungsbeispielen beschriebene Plattenkokille beschränkt. Entsprechende Vorteile ergeben sich auch bei anderen Kokillen, mit denen sich in halb- oder vollkontinuierlicher Weise metallische Formstränge herstellen lassen, zum Beispiel Rohrkokillen, Blockkokillen, Gießräder, Gießwalzen und Gießwalzenmäntel.The use of the alloy to be used according to the invention is not only limited to the plate mold described in the exemplary embodiments. Corresponding advantages also arise with other molds with which metallic mold strands can be produced in a semi-continuous or fully continuous manner, for example tubular molds, block molds, casting wheels, casting rolls and casting roll shells.

Claims (4)

Verwendung einer aushärtbaren Kupferlegierung aus 0,1 bis 2 % Nickel, 0,3 bis 1,3 % Chrom, 0,1 bis 0,5 % Zirkonium, gegebenenfalls bis zu 0,2 % mindestens eines Elements aus der Phosphor, Lithium, Kalzium, Magnesium, Silizium und Bor umfassenden Gruppe, Rest Kupfer einschließlich herstellungsbedingter Verunreinigungen als Werkstoff mit gezielt einstellbarer elektrischer Leitfähigkeit zur Herstellung von Gießformen, insbesondere Stranggießkokillen, bei denen schmelzflüssiges Metall durch Einwirkung von elektromagnetischen Kräften gerührt wird.Use of a hardenable copper alloy of 0.1 to 2% nickel, 0.3 to 1.3% chromium, 0.1 to 0.5% zirconium, optionally up to 0.2% of at least one element from the phosphorus, lithium, calcium , Magnesium, silicon and boron group, the rest of copper including manufacturing-related impurities as a material with selectively adjustable electrical conductivity for the production of casting molds, in particular continuous casting molds, in which molten metal is stirred by the action of electromagnetic forces. Verwendung einer aushärtbaren Kupferlegierung nach Anspruch 1, die 0,4 bis 1,6 % Nickel, 0,6 bis 0,8 % Chrom, 0,15 bis 0,25 % Zirkonium, mindestens ein Element aus der Gruppe 0,005 bis 0,02 % Bor, 0,005 bis 0,05 % Magnesium und 0,005 bis 0,03 % Phosphor, Rest Kupfer einschließlich herstellungsbedingter Verunreinigungen für den in Anspruch 1 genannten Zweck.Use of a hardenable copper alloy according to claim 1, the 0.4 to 1.6% nickel, 0.6 to 0.8% chromium, 0.15 to 0.25% zirconium, at least one element from the group 0.005 to 0.02 % Boron, 0.005 to 0.05% magnesium and 0.005 to 0.03% phosphorus, balance copper including manufacturing-related impurities for the purpose mentioned in claim 1. Verwendung einer aushärtbaren Kupferlegierung nach Anspruch 1 oder 2, die außerdem noch bis zu 0,2 % Titan und/oder bis zu 0,4 % Eisen enthält.Use of a hardenable copper alloy according to claim 1 or 2, which also contains up to 0.2% titanium and / or up to 0.4% iron. Verwendung einer aushärtbaren Kupferlegierung nach einem der Ansprüche 1 bis 3, die außerdem noch bis zu 0,8 % Aluminium und/oder bis zu 0,8 % Mangan enthält.Use of a hardenable copper alloy according to one of claims 1 to 3, which also contains up to 0.8% aluminum and / or up to 0.8% manganese.
EP95110134A 1994-08-06 1995-06-29 Use of a hardenable copper alloy Expired - Lifetime EP0702094B1 (en)

Applications Claiming Priority (2)

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DE4427939A DE4427939A1 (en) 1994-08-06 1994-08-06 Use of a hardenable copper alloy
DE4427939 1994-08-06

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EP0702094A1 true EP0702094A1 (en) 1996-03-20
EP0702094B1 EP0702094B1 (en) 1999-10-27

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EP (1) EP0702094B1 (en)
JP (1) JPH08104928A (en)
KR (1) KR100374051B1 (en)
CN (1) CN1058532C (en)
AT (1) ATE186076T1 (en)
DE (2) DE4427939A1 (en)
ES (1) ES2139780T3 (en)
FI (1) FI112669B (en)
PL (1) PL177973B1 (en)
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ZA (1) ZA956181B (en)

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DE10032627A1 (en) * 2000-07-07 2002-01-17 Km Europa Metal Ag Use of a copper-nickel alloy
JP3731600B2 (en) * 2003-09-19 2006-01-05 住友金属工業株式会社 Copper alloy and manufacturing method thereof
DE102008015096A1 (en) * 2008-03-19 2009-09-24 Kme Germany Ag & Co. Kg Process for producing molded parts and molded parts produced by the process
KR101364542B1 (en) * 2011-08-11 2014-02-18 주식회사 풍산 Copper alloy material for continuous casting mold and process of production same
CN102392154B (en) * 2011-11-25 2014-04-02 汕头华兴冶金设备股份有限公司 High-strength and high-conductivity copper alloy material

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DE59507131D1 (en) 1999-12-02
PL309841A1 (en) 1996-02-19
US6565681B1 (en) 2003-05-20
JPH08104928A (en) 1996-04-23
FI953730A (en) 1996-02-07
KR100374051B1 (en) 2003-05-09
KR960007802A (en) 1996-03-22
DE4427939A1 (en) 1996-02-08
CN1122837A (en) 1996-05-22
FI953730A0 (en) 1995-08-04
FI112669B (en) 2003-12-31
RU2160648C2 (en) 2000-12-20
ZA956181B (en) 1996-03-08
ATE186076T1 (en) 1999-11-15
EP0702094B1 (en) 1999-10-27
PL177973B1 (en) 2000-02-29
ES2139780T3 (en) 2000-02-16
CN1058532C (en) 2000-11-15

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